聚维酮碘对三疣梭子蟹大眼幼体及仔蟹的急性毒性研究

研究了聚维酮碘对三疣梭子蟹大眼幼体和Ⅰ期仔蟹的急性毒性。试验结果表明,聚维酮碘对大眼幼体的24 h半致死质量浓度为36.661 mg/L,48 h的半致死质量浓度为29.105 mg/L,安全质量浓度为5.519 mg/L;对Ⅰ期仔蟹的24 h半致死质量浓度为35.467 mg/L,48 h的半致死质量浓度为19.887 mg/L,安全质量浓度为1.876 mg/L。三疣梭子蟹大眼幼体和Ⅰ期仔蟹对聚维酮碘的耐药性均随时间的延长而降低;在质量浓度为10、13 mg/L的条件下能分别促进大眼幼体和Ⅰ期仔蟹的蜕皮变态,提高蜕壳后的成活率。     

石灰浆荷电雾化特性的试验

将静电效应引入石灰浆烟气脱硫中,是烟气脱硫技术发展的新途径.而对石灰浆荷电雾化特性的研究则是石灰浆荷电雾化脱硫技术的关键.首次应用三维粒子动态分析仪（3D- PDA） 建立石灰浆荷电雾化试验装置,测定了石灰浆荷电雾化后的速度和粒径分布特性.对不同的荷电电压和石灰浆流量进行了测试,并运用相关的数据处理方法,得到了荷电石灰浆滴的三维速度与粒径的相关和统计特性.结果表明静电效应的引入能很好地提高石灰浆雾化质量,同时提高了浆滴的速度以及改善了粒径分布的均匀性,在荷电电压为5～10 kV时效果尤为明显.     

茂名小良林地资源类型动态模型预测

通过对小良林地资源类型利用状态的研究，根据样地资源的变化资料，应用马尔可夫法的分析理论，建立预测模型，以分析、预测林地资源利用的动态变化，以寻求一个稳定状态，为林地利用规划和经济发展决策提供科学的依据。     

An Adaptive Kernel Smoothing Method for Classifying Austrosimulium tillyardianum (Diptera: Simuliidae) Larval Instars

In insects, the frequency distribution of the measurements of sclerotized body parts is generally used to classify larval instars and is characterized by a multimodal overlap between instar stages. Nonparametric methods with fixed bandwidths, such as histograms, have significant limitations when used to fit this type of distribution, making it difficult to identify divisions between instars. Fixed bandwidths have also been chosen somewhat subjectively in the past, which is another problem. In this study, we describe an adaptive kernel smoothing method to differentiate instars based on discontinuities in the growth rates of sclerotized insect body parts. From Brooks’ rule, we derived a new standard for assessing the quality of instar classification and a bandwidth selector that more accurately reflects the distributed character of specific variables. We used this method to classify the larvae of Austrosimulium tillyardianum (Diptera: Simuliidae) based on five different measurements. Based on head capsule width and head capsule length, the larvae were separated into nine instars. Based on head capsule postoccipital width and mandible length, the larvae were separated into 8 instars and 10 instars, respectively. No reasonable solution was found for antennal segment 3 length. Separation of the larvae into nine instars using head capsule width or head capsule length was most robust and agreed with Crosby’s growth rule. By strengthening the distributed character of the separation variable through the use of variable bandwidths, the adaptive kernel smoothing method could identify divisions between instars more effectively and accurately than previous methods.     

国家标准分幅1：1万地形图图幅编号的算法

本文给出了通过经纬度坐标计算1:1万地形图图幅编号的算法,以及通过1:1万地形图图幅编号计算图廓点经纬度坐标的算法。     

茶叶片结构特征对产量形成和扦插发根的影响

本文研究了茶树叶片的解剖结构,认为栅状细胞的细长度、数目、厚度、直接或间接影响光合产物的水平,光合曲线,以及栅状组织内叶绿体数目。栅状组织的以上指标与产量和扦插发根率成正相关。     

荆州市农产品电子商务发展现状及对策研究

随着互联网的普及与网络技术的进步,农产品电子商务获得了很大的发展,B2C、C2C、C2B、O2O等各种电子商务模式竞相推出,越来越多的新型网络工具,如微博、微信、抖音和淘宝直播为各大商家提供了越来越多的营销获客渠道。荆州市位处江汉平原的中心地带,与长江流域的黄金水道紧紧相邻,是一个农业全方位发展的标志性城市。但荆州市在农产品电子商务领域的发展态势还处于初级阶段,各种条件还不太成熟,信息化建设以及物流配送等基础设施尚不完善,大部分农产品销售仍然需要借助第三方电商平台。调查了荆州市区域内关于农产品电子商务发展过程中存在的主要问题,结合国内农产品与电子商务融合发展的大环境对这些问题进行了分析,最后提出了发展荆州市本土农产品电子商务的相关建议和对策。     

广西香蕉真菌性叶斑病病原菌种群结构分析

2009年2-3月对广西香蕉主产区真菌性叶斑病病原进行抽样鉴定。结果显示,广西香蕉真菌性叶斑病病原至少有10种,主要病原为Cordana musae,分布广,检出率为56.77%~92.19%;Corynespora cassiicola和Deightoniella torulosa为次,两种病原菌均主要集中在南宁地区,检出率分别为32.34%和22.61%;叶斑病类型以单一病原侵染为主,检出率为78.13%~92.19%;复合侵染的叶斑病类型以2种病原共同侵染居多。     

无铅无泥鹌鹑松花蛋的研制

用I_2、KI、CuSO_4、FeSO_4及其不同组成的混合物代替传统松花蛋配方中的PbO制作鹌鹑松花蛋,与铅法和锌法作对照,筛选出碘混合物配方较好,并用正交试验确定其最佳工艺条件为NaOH4.0％、碘混合物0.2％、温度20℃。形成鹌鹑松花蛋的关键是NaOH浓度,其次为碘混合物百分含量。成品用食品级涂料涂膜保鲜,室温下存放2个月其失重<4.3％,杂菌数<30个/g。